After circumcision, caring for the penis is simple but important. Wash the area gently with warm water. Pat dry and put on a new bandage with antibiotic ointment each time you change the diaper. It should take about a week to heal. It's normal for there to be a little swelling, redness and maybe blood at first. If these problems last several days or get worse, have your baby seen by his doctor. Also talk to your baby's doctor if he gets a fever or doesn't have a wet diaper within 12 hours of circumcision. Almost all side effects are easily treated.